Arc-lamp.



BEST'AVAILABLECOP" PATENTED JUNE 16, 1908.

E FLEMING. ARC LAMP.

APPLICATION FILED my 18, 1904.

Fig. l.

Witnesses u fi m/ wdfl a Tmh R w RICHARD FLEMING, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ARC-LAMP.

Specification of Letters Patent.

Patented June 16, 1928.

Application filed May 18, 1904. Serial No. 208,495.

To all whom it may concern:

Be it known that I, RICHARD FLEMING, a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Imrovements in Arc-Lamps, of which the folowing is a specification.

My present invention relates to are lam s, more particularly: of the ty e in which t e electrodes employedare sucli as to insure a flaming or luminous are.

The invention consists in certain features of construction and operation of the feeding mechanism of the lamp and in the means emare andfor ventilating the lamp ployed for disposing of the fumes from the mechanism.

The features of novelty whic characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of my invention, however, reference may be had to the accompanying.

drawings and description in which I have illustrated and descri ed one embodiment of Of the drawings, Figure 1 is .a sectional elevation of an arc lamp embodying my invention; Fig. 2 is a perspective view-showing a portion of the combined lamp casing and chimney; and Fig. 3 is diagram illustrating the circuit arrangement of the lamp.

-Referring to the drawings, 1 represents a hood or top of the usual form. A hollow post 2 extends downward from the center of the hood 1 to which it is rigidly secured in any suitable manner. The lower end of the st 2 supports a disk shaped horizontal latorm 3. A pair of vertical solenoid s unt "coils 4 are secured to the post 2 between its ends. A rod 6 carried by the movable armature cooperating with the shunt coils 4 passes through an'aperture formed for the pur ose in the platform 3. A air of vertica solenoid coils 8, somewhat onger than the coils 4, are also secured to the post 2 between its ends at the side of the post 2 opposite to that upon which the shunt coils 4 are secured. A rod 10 extending through the platform 3 has its upper end secured to the movable armature 9 co'operatingwith the coils. One member of a dash- 0t 11 issecured to the armature 9, the ot er mem er -of the dash-pot being securedto the pl tform 3. The dash-pot 1 1 is arranged to prevent a rapid upward movement of the armture 9 when the coils 8 are energized.

An annular member 13 having aradially extending portion 14 and a cylindrical portion 15 is carried below the platform 3 by posts 16. The radial portion 14 is parallel to the platform 3. Abent arm 17 secured to the under side of theradial portion 14 has a socket 18 formed in its lower end in which the lower electrode 19- of the lamp is held in line with the axis of the hollow post 2. The lower electrode ofthe lamp is referably the negative electrode when the amp is to be operated with direct'current and contains or is formed of some material which yields .a flaming or luminous arc, such for instance as the magnetic'oxid of iron or. the like. The upper electrode 20 of the lamp, which may be ormed of the same or different 'mate rial from that of which the electrode 19 is com osed', slides Within-the hollow post 12 and as its lower end cylindrical portion 15.

The lower end of the rod 10 has secured to it an'arm 21 which extends at right angles to the rod. This'arm 21 has formed in it an elongated slot or passage through which the electrode 20 passes. A member 22 is pivoted to the arm 21 at the oint 23. The member 22 is also formed wit an elongated slot in it through which'the electrode 20 passes. The openings inthe arm 21 and member 22 are so prolportioned and arranged that in the nor ma operation of the lamp the electrode 20'is rigidly held between the right hand end wallof the slot in the member 21 and the left hand end wall of the slot in the member 22. The extreme right hand end of the member 22 is bifurcated to slidinglyreceive the lower end projecting through the of the rod 6. A projection 24 which may be in the form of a pin inserted in one of a series of holes 25 in the lower end of the rod, 6 serves as a means for raising the right hand end of the member 22 to release the upper electrode at a suitable stage in the operation of the lamp.

A casing 26 having its upper end secured in an suitable manner to the hood 1 surroun s the lamp mechanism. com rises an inner cylindrical member 27 whic closely embraces the platform 3 and which extends from a point adjacent the rag dial portion of the member 14 to a point near the upper end of the casing, and an outer cy- The casing bars 27 and 28: the ends of the pipe sections to make ti ht joints'between the pi seclindrical member 28 which maybe I.concen-' the upper end of the casing to apoint about pipe 33 which extend throng apertures ,means of screws 37. .The': member 36 suptrio with the member 27 and which is separated therefrom. byan annular space on chamber 29 which extends from a point near midway between the platform 3 and the radial portion 14 of the member 13. Ap'ertures 30 are formed in the portion oflthe member 27 immediately belowthe platform 3.. Apertures 31 are formed in" the member 28 near its upper end. Passages 32 extend through'the casing- 26. These passages maybe formed b sections of ormed in line with each other in the mem- 33 may be upset- 'or turned outwardly as shown to lock the pipe-sections in place and tion's and't e members 27- and 28,. hood or water guard 34 is carriedby the member- 28in such 31811116138 to prev'ent'the passage I of moisture or .dust into the interior of the member 27. An annular hood 35 secured to the member 28 near its lower end su v ports an annular member 36 in anysuitab e manner as by ports in turn 'a transparent. or translucent globe 38 which surrounds the lowerportion of the lamp mechanism and protects or incloses the arcj Referring to Fi 3 of the drawings, 40: and

41 represent con uctors which supply current to the lamp terminals. A. con uctor 42 leads from the conductor 40 .to one terminal of the series coils 8. The-other terminal of the series .coils 8 is connected to the upper electrode 20 of the lamp by aconductor 43. A conductor 44 connects the line 41 to one terminal of the resistancecoil 45 (not shown in the other figures of the drawings). The other terminal of the resistance coil 45 is connected to the lower electrode of the lamp by a conductor 46. A conductor 47 connects the conductor 46 with one terminal of the shunt coils 4. The other terminal of the shunt coils 4 is connected to the conductor 43.. Assuming the position ofthe electrodes of the lamp to be that shown in Fig.1, in which it is seen they are separated by a short distance, upon connectin the lamp in circuit the shunt coils 4 will be energized and the armature 5 will raise the rod 6. The engagement of the member 22 by. the projection 24 and consequent upward movement of the member 22 will release the electrode 20 which i will thereupon drop .into contact with the electrode '19. -Upon contact between the 'thedrawings, "1

BEST AVAILABLE COP.

the armature Q and rod 10 will be raised. As the deenergiz'ation bf the shunt coils occurs simultaneously with the energization of the series coils;. and as an id movement of the armaturejQis prevente by the dash-pct 11,. the electrode 20 will be immediately clamxped between the members 21 and 22 and wi raised -by'the upward movement of the arma- I ture 9 to draw an arc of the proper length between the electrodes 19 and 20.

When by reason of the consumption of the electrodes or fromothercauses, the voltage of the arc-increases sufii'ciently beyond its and .8 will; of course, become entirely dc5nergize'd and the armatures will both descend to their original position. Inasmuch, how

ever, as the electrodes when running long enoughto .become hot will necessarily be consumed somewhat, the downward movement of the armature 9 will; not be great enough to allow' the lower end of the electrodes 20 to engage the end. of the electrode 19, and the electrodes will thereforehe separated as shown in Fig. 1. This is an important feature, as when the electrodes are al lowed to come to ether while hot they are apt to stick or we d together.

- The gases or'va ors produced by the are mixed with fsuitab e amounts of air which may enter the interior of the globe between its upper end and the member 36 will pass through the a rtures 30 into the space 29 and thenput ofihe chamber through the apertures 31 as indicated by the small arrows in Figu'laf-The distance between the aper- 'n'rova'l of the condensedmaterial the casing maybe removed from the';lamp if desired, though this is not u'suallynecessary. The air for.coolingthe-coilsand other mechani'smilocatedHfiithin-the. casing member 27 inthroug'h the passages 32 and out tween-the u perend of the casing and the hood 1,1111; indic ted by the small arrows in Changes made in the form and pro-- portionjofithe arts comprising the construetion-illustrate --without departing from the from time to time of the upper elec- B ST AvmLAsLEooP i spirit of my invention, and I do not intend th'eclaims hereinafter made to be limited to the construction shown more than is made necessary by the state of the art. What I claim as new and desire to secure by Letters Patent of the United States, is, a 1. In an arc lamp, a movable electrode and &mechanism for moving it, a casing surrounding-said mechanism, a second casing sur-- rounding the first-but separated'therefrom by a space through which-the are products can pass, and a member connecting said cas- 1ngs,sa1d member being formed with-a passage through it by means of which-the venti lation of the mechanism is secured-l 2 In an arc lamp, a movable electrode-and mechanism for moving it, a casing inclosing said mechanism, a second casing surrounding the first but separated therefrom to forrn a space through which the arc Pass from the lamp, both of sai casings hav- .1ng apertures formed inthem, and a pipe or Qconduit connecting said apertures;

(products can 1 3; In an arc lamp, the combination with a horizontal partition, of a double-walled vertical annular casing throu h which the vapors are drawn by natural aft and in which they condense before their escape from the lamp, suitable o enings being provided for the ventilation o the interior of the lamp and the cooling of theinner wall of the annular casing.

4. In combinationin an arc'larnp with a horizontal partition above the are, a doublewalled annular casing through which the vapors generated are forced to pass before es caping from the lamp, perforations in the lower and upper arts of said casing for said vapors, and tubu ar lateral passages through the wall of thecasing to admit fresh aiig.

In witness whereof, I have hereunto 'set my hand this 16th day of May, 1904.

. RICHARD FLEMING. Witnesses:

DUGALD MoKI'MoKILLor', JOHN. AQMCM N s. 

